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Convertible Senior Notes (Schedule of Interest Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Convertible Senior Notes [Abstract]    
Contractual interest expense $ 3,375 $ 1,688
Amortization of debt issuance costs 153 74
Total interest expense $ 3,528 $ 1,762